add front demo in this project

LFtid1056/cloudfront/code/log4cplus/spi/rootlogger.h

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+// -*- C++ -*-
+// Module:  Log4CPLUS
+// File:    rootlogger.h
+// Created: 6/2001
+// Author:  Tad E. Smith
+//
+//
+// Copyright 2001-2017 Tad E. Smith
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/** @file */
+
+#ifndef LOG4CPLUS_SPI_ROOT_LOGGER_HEADER_
+#define LOG4CPLUS_SPI_ROOT_LOGGER_HEADER_
+
+#include <log4cplus/config.hxx>
+
+#if defined (LOG4CPLUS_HAVE_PRAGMA_ONCE)
+#pragma once
+#endif
+
+#include <log4cplus/spi/loggerimpl.h>
+
+namespace log4cplus {
+    namespace spi {
+
+        /**
+         * RootLogger sits at the top of the logger hierachy. It is a
+         * regular logger except that it provides several guarantees.
+         *
+         * First, it cannot be assigned a <code>NOT_SET_LOG_LEVEL</code>
+         * LogLevel. Second, since root logger cannot have a parent, the
+         * getChainedLogLevel method always returns the value of the
+         * ll field without walking the hierarchy.
+         */
+        class LOG4CPLUS_EXPORT RootLogger : public LoggerImpl {
+        public:
+          // Ctors
+            /**
+             * The root logger names itself as "root". However, the root
+             * logger cannot be retrieved by name.  
+             */
+            RootLogger(Hierarchy& h, LogLevel ll);
+
+          // Methods
+            /**
+             * Return the assigned LogLevel value without walking the logger
+             * hierarchy.
+             */
+            virtual LogLevel getChainedLogLevel() const;
+
+            /**
+             * Setting a NOT_SET_LOG_LEVEL value to the LogLevel of the root logger 
+             * may have catastrophic results. We prevent this here.
+             */
+            void setLogLevel(LogLevel);
+
+        };
+
+    } // end namespace spi
+} // end namespace log4cplus
+
+#endif // LOG4CPLUS_SPI_ROOT_LOGGER_HEADER_
+